CVE-2026-18634 Deserialization in GMS
A local attacker can exploit insecure deserialization in SonicWall GMS to perform unauthorized actions, potentially leading to privilege escalation or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18634?
CVE-2026-18634 is a high-severity unsafe deserialization vulnerability in SonicWall GMS, published on 11 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An insecure handling of serialized objects vulnerability was found in the one of the service of GMS application 9.5.1 (Build 9510.1044) and earlier versions. A local attacker with the ability to interact with the service could exploit this behavior to perform unauthorized actions through the affected component.
Weakness: CWE-502
Which versions are affected by CVE-2026-18634?
How do I fix CVE-2026-18634?
No fix has been published for CVE-2026-18634 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-18634 being exploited?
There is no known exploitation of CVE-2026-18634 in the wild and no public exploit code.
Sources
Also known as GHSA-v8fc-x528-77rr.